Ricinulei
Videos
Ricinulei is a small order of arachnids. Like most arachnids, they are predatory; eating small arthropods. They occur today in west-central Africa and the Americas from Brazil to southern Texas, where
Ricinoides atewa nymph from Ghana
Male Ricinoides karschii from Campo Reserve, Cameroon
Male Pseudocellus pearsei from Grutas Tzabnah, Yucatán, Mexico
Book lung
Videos
A book lung is a type of respiration organ used for atmospheric gas exchange present in some arachnids such as scorpions and tetrapulmonates. It is a terrestrial adaptation of the book gills seen in a
In this spider diagram, the position of the book lungs is labelled 1.
Underside of female horseshoe crabs showing the legs and book gills